heliotherapy
The Sun's outermost electromagnetic domain is called the heliosphere.
As scientists research the sun in an effort to make weather predictions, they have been using helioseismology.
The exhibit has a heliochronometer made in the early 1700s, a pocket watch with a tiny sundial that folds into the watch case.
SMART Vocabulary: related words and phrases Astronomy
albedo
Andromeda
Aquarius
Aries
asteroid
galactic
galaxy
Gemini
geostationary
geosynchronous
observatory
orbit
orbital
Orion
penumbra
substellar
sunspot
supergiant
supermassive
supermoon
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